Global climate change (such as warming and aggravation of drought) alters soil microbial diversity and functions and affects terrestrial ecosystem services. Therefore, revealing the responses and feedbacks of soil microorganisms will help us comprehensively understand and predict the impact of global climate change on terrestrial ecosystems. impact and its future trends. Research on soil microbes in global climate change has been carried out for many years, but most of them focus on local or regional scales. Global-scale research can cover multiple ecosystems, with a wider range of environmental gradients and more detailed data sets, which can help simplify the multi-dimensional ecology and improve the signal-to-noise ratio of the data. In addition, more and more recent studies have found that there is a threshold effect in the response of microorganisms to environmental changes, that is, it is not a gradual one, but more of a sudden (intensity and direction) response.
Based on the above understandings and breakthroughs in model algorithms, Feng Youzhi, a researcher at the Nanjing Institute of Soil Sciences, Chinese Academy of Sciences, joined forces with the Institute of Natural Resources and Agrobiology of Seville, Spain, the University of Alicante, the German Center for Integrated Biodiversity Research, and the University of Western Sydney, Australia, etc. The research unit , in a space-for-time manner, by studying the geographical distribution pattern of a key functional microbial group in the process of soil organic matter transformation, saprophytic fungi, infers the impact and possible effects of global warming on microbial diversity and its ecological functions. feedback. The study found that temperature nonlinearly controlled the geographic distribution of global soil saprophytic fungi. Among them, multiple environmental temperature thresholds affect global soil saprophytic fungi abundance changes , such as the annual mean temperature of ~9°C, the soil temperature of ~22°C, and the maximum temperature of the hottest month of ~28°C. Once the corresponding ambient temperature crosses the above threshold, soil saprophytic fungi abundance will drop sharply, and this phenomenon is more sensitive in arid regions of the world. In view of the positive correlation with the amount of CO2 released by soil heterotrophic respiration and the close threshold of soil carbon content, the steep decline in soil saprophytic fungi suggests that there may be multiple abrupt changes in ambient temperature under future global warming. It will lead to multiple cliff-like collapses in the element geochemical cycle driven by soil microorganisms, which will lead to unpredictable negative impacts on terrestrial ecosystems. Based on the above knowledge, the study drew the first global distribution map of soil saprophytic fungi. This research work expands and refines the content on soil microorganisms in the article "Global ecosystem thresholds driven by aridity" (https://doi.org/10.1126/science.aay5958) published in Science in early 2020.
Original link ↓
https://doi.org/10.1111/gcb.16096
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Source of this article: Nanjing Institute of Soil Sciences, Chinese Academy of Sciences
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